Key result
Two cases of hyperthyroidism presenting as new-onset AF highlight the need for routine thyroid evaluation.
Why the study?
AF is a potentially reversible manifestation of hyperthyroidism that may occasionally precede classic thyrotoxic symptoms.
Case Report (n=2)
Emphasizes the importance of routine thyroid evaluation in patients presenting with new-onset atrial fibrillation.
Should not yet change AF evaluation practices; leaves open whether routine thyroid screening improves outcomes.
Atrial fibrillation (AF) is a recognised but potentially reversible manifestation of hyperthyroidism and may occasionally precede classic thyrotoxic symptoms. We report two cases in which AF was the initial presentation of hyperthyroidism with distinct aetiology and clinical severity. The first had rapid AF from Graves' disease, and the second had new-onset AF due to a solitary toxic adenoma. These cases emphasise the importance of routine thyroid evaluation in patients presenting with new-onset AF.
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Viswanathan et al. (2026) conducted a case report in Atrial fibrillation and hyperthyroidism (n=2). Hyperthyroidism, presenting initially as atrial fibrillation in two reported cases of Graves' disease and toxic adenoma, highlights the need for routine thyroid evaluation in new-onset AF.
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